JP2006207561A - Nozzle holder made of sintered alloy for internal combustion engine, its molding die, and its forming method - Google Patents

Nozzle holder made of sintered alloy for internal combustion engine, its molding die, and its forming method Download PDF

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JP2006207561A
JP2006207561A JP2005024403A JP2005024403A JP2006207561A JP 2006207561 A JP2006207561 A JP 2006207561A JP 2005024403 A JP2005024403 A JP 2005024403A JP 2005024403 A JP2005024403 A JP 2005024403A JP 2006207561 A JP2006207561 A JP 2006207561A
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nozzle holder
sintered alloy
green compact
arm
base end
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Shinichi Fujiwara
真一 藤原
Masao Ikoshi
正夫 井越
Arata Takahashi
新 高橋
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Diamet Corp
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Diamet Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle holder made of a sintered alloy capable of securing durability of a die and reducing the manufacturing cost. <P>SOLUTION: The nozzle holder 1 has an insertion opening 3 into which an injection nozzle is inserted from a side face, provided at the tip end of left and right arm parts 2, 2. The base end sides of both the arm parts 2, 2 are joined by an arc-shaped inner face 4. Protrusion parts 5, 5 are protrudingly provided engaging a flange part of the injection nozzle on the lower face of the tip ends of both the arm parts 2, 2. The base end side of the protrusion part 5 is connected to the lower face of the base end side of the arm part 2 by an inclination part 6. A recess part 21 is provided on the inner face of the inclination part 6, a step part 22 is formed between the inner face of the protrusion part 5 and the recess part 21, and the base end of the protrusion part 5 engaging the injection nozzle and the lower face of the base end side of the arm part 2 is joined by the inclination part 6. An upper punch forming a green compact before sintering does not become acute, because the tip end of the part forming the inclination part 6 and the recess part 21 has a thickness corresponding to the step part 22. Thereby, a die strength can be secured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、内燃機関用焼結合金製ノズルホルダーとその成形用金型及び製造方法に関する。   The present invention relates to a sintered alloy nozzle holder for an internal combustion engine, a molding die thereof, and a manufacturing method thereof.

従来、この種のものとして、シリンダヘッドに設けた穴に筒状の噴射ノズルを挿入し、この噴射ノズルの径小の先端がシリンダ内に露出し、この噴射ノズルの上部には切り欠き部が形成され、前記穴の近傍にはネジ穴が設けられており、このネジ穴にボルトを螺合させてあり、このようにしてシリンダヘッドに固定した前記ボルトに、ノズルクランプ（ノズルホルダー）が差し込まれて使用され、シャフトにナットを螺入してノズルクランプをボルトに取り付けることで、噴射ノズルが穴内において固定される（例えば、特許文献１及び特許文献２）。   Conventionally, as this type, a cylindrical injection nozzle is inserted into a hole provided in the cylinder head, a small-diameter tip of the injection nozzle is exposed in the cylinder, and a notch is formed at the top of the injection nozzle. A screw hole is provided in the vicinity of the hole, and a bolt is screwed into the screw hole, and a nozzle clamp (nozzle holder) is inserted into the bolt thus fixed to the cylinder head. The injection nozzle is fixed in the hole by screwing the nut into the shaft and attaching the nozzle clamp to the bolt (for example, Patent Document 1 and Patent Document 2).

また、製品コストを抑えるために、鉄系金属粉からなる原料粉末を成形型に充填した後、原料粉末を圧縮して圧粉体を成形し、この圧粉体を焼結した焼結合金からなるノズルホルダーがあり、このノズルホルダーは、左右の腕部からなる二股部を有する（例えば、特許文献３）。   In order to reduce the product cost, the raw material powder made of iron-based metal powder is filled in a mold, and then the raw material powder is compressed to form a green compact, and the sintered compact is obtained by sintering the green compact. This nozzle holder has a bifurcated portion composed of left and right arm portions (for example, Patent Document 3).

図８に上記のノズルホルダーの一例を示すと、ノズルホルダー101は、左右の腕部102，102の先端に噴射ノズルを側面から挿入する挿入開口部103を有し、前記両腕部102，102の基端側内面を円弧状内面104により連結し、前記両腕部102，102の先端下面に前記噴射ノズルに係合する突設部105，105を突設し、この突設部105の基端側と前記腕部102の基端側下面とを傾斜部106により連結し、両腕部102，102間に前記噴射ノズルを嵌合保持する。   FIG. 8 shows an example of the nozzle holder described above. The nozzle holder 101 has an insertion opening 103 for inserting the injection nozzle from the side at the tips of the left and right arms 102 and 102, and the both arms 102 and 102. Are connected to each other by an arcuate inner surface 104, and projecting portions 105, 105 that engage with the injection nozzle are provided on the lower surfaces of the distal ends of the arms 102, 102. The end side and the lower surface of the base end side of the arm portion 102 are connected by an inclined portion 106, and the spray nozzle is fitted and held between the arm portions 102 and 102.

このような焼結合金製のノズルホルダー101においては、成形及び強度上から製品に屈曲角部を設けることは好ましくなく、このため前記突設部105の基端側と前記腕部102の基端側下面とを傾斜部106により連結している。   In such a sintered alloy nozzle holder 101, it is not preferable to provide a bent corner portion in the product from the viewpoint of molding and strength. For this reason, the proximal end side of the protruding portion 105 and the proximal end of the arm portion 102 are not preferable. The side lower surface is connected by an inclined portion 106.

また、噴射ノズルにノズルホルダー101をスライド装着する場合（例えば特許文献３の図１）、装着を容易にすると共に、腕部102，102間の基端側下面107がノズルやシリンダヘッドの部材に緩衝しないようにするため、その下面107をスライド方向に沿った略水平方向の平坦面に形成している。   In addition, when the nozzle holder 101 is slid and attached to the injection nozzle (for example, FIG. 1 of Patent Document 3), the attachment is facilitated, and the base-side lower surface 107 between the arms 102 and 102 is used as a member of the nozzle or cylinder head. In order to prevent buffering, the lower surface 107 is formed on a flat surface in a substantially horizontal direction along the sliding direction.

そして、上記のようなノズルホルダー101では、噴射ノズルに係合する両腕部102，102及び円弧状内面104の寸法管理が重要であり、特に両腕部102，102間の寸法に高い精度が求められるから、従来、焼結合金製のノズルホルダー101では、両腕部102，102の内面を機械加工により切削して所定の寸法精度を得るようにしている。
実開平３−１２２２６５号公報 特開平９−１４４６１８号公報 特開２００４−１９０１０５号公報 In the nozzle holder 101 as described above, it is important to manage the dimensions of the arms 102 and 102 and the arcuate inner surface 104 that engage with the injection nozzle, and in particular, the dimension between the arms 102 and 102 is highly accurate. Therefore, conventionally, in the nozzle holder 101 made of a sintered alloy, the inner surfaces of both arms 102 and 102 are cut by machining to obtain a predetermined dimensional accuracy.
Japanese Utility Model Publication No. 3-122265 JP-A-9-144618 JP 2004-190105 A

しかし、製品コストを抑えるために、ノズルホルダー101を焼結合金製としても、機械加工を行うと、その分の工数増加及びコスト上昇が避けられない。   However, even if the nozzle holder 101 is made of a sintered alloy to reduce the product cost, if machining is performed, an increase in man-hours and an increase in cost are inevitable.

また、上記図の形状のノズルホルダー101を焼結合金で製造し、機械加工を行わない場合、図９及び図１０に示すように、原料粉末を圧縮するパンチ111は、ノズルホルダー101の下面に対応した形状を備え、円弧状内面104に連続する突設部105の内面と腕部102の下面107とを連結する箇所を形成する部分112が先鋭となる。このようなパンチ111で原料粉末の圧縮成形を繰り返し行うと、前記先鋭な部分112が損傷し、パンチ111の耐久性の低下を招く問題がある。   Further, when the nozzle holder 101 having the shape shown in the figure is manufactured from a sintered alloy and is not machined, the punch 111 for compressing the raw material powder is formed on the lower surface of the nozzle holder 101 as shown in FIGS. A portion 112 having a corresponding shape and forming a portion connecting the inner surface of the protruding portion 105 continuous with the arc-shaped inner surface 104 and the lower surface 107 of the arm portion 102 is sharpened. When the compression molding of the raw material powder is repeatedly performed with such a punch 111, the sharp portion 112 is damaged, and there is a problem in that the durability of the punch 111 is lowered.

本発明は、このような問題点を解決しようとするもので、金型の耐久性を確保することができ、製造コストの削減が可能な内燃機関用焼結合金製ノズルホルダーとその成形用金型及び成形方法を提供することを目的とし、さらに、焼結合金の機械加工を不要とすることを目的とする。   SUMMARY OF THE INVENTION The present invention is intended to solve such problems. A sintered alloy nozzle holder for an internal combustion engine capable of ensuring the durability of a mold and reducing the manufacturing cost, and a molding metal for the same. It is an object to provide a mold and a forming method, and further to eliminate the need for machining a sintered alloy.

請求項１のノズルホルダーは、内燃機関の燃料を噴射する前記噴射ノズルの固定に用いられ、左右の腕部の先端に噴射ノズルを側面から挿入する挿入開口部を有すると共に、前記両腕部の基端側を連結内面により連結し、前記両腕部の先端下面に前記噴射ノズルに係合する突設部を突設し、この突設部の基端側と前記腕部の基端側下面とを傾斜部により連結し、前記両腕部間に前記噴射ノズルを嵌合保持する焼結合金製ノズルホルダーであって、前記傾斜部の内面に凹部を設けると共に、前記突設部の内面と前記凹部との間に段部を形成したものである。   The nozzle holder according to claim 1 is used for fixing the injection nozzle for injecting fuel of the internal combustion engine, and has insertion openings for inserting the injection nozzles from the side surfaces at the ends of the left and right arms, and The base end side is connected by a connecting inner surface, and a projecting portion that engages with the injection nozzle is projected on the lower end lower surface of the both arm portions, and the proximal end side of the projecting portion and the lower end side lower surface of the arm portion And a nozzle holder made of a sintered alloy that fits and holds the spray nozzle between the both arm portions, the inner surface of the inclined portion is provided with a recess, and the inner surface of the protruding portion A step portion is formed between the concave portion and the concave portion.

また、請求項２のノズルホルダーは、前記凹部の上面は前記腕部の基端側下面と略面一に形成されているものである。   According to a second aspect of the present invention, the upper surface of the recess is substantially flush with the lower surface of the base end side of the arm portion.

また、請求項３の成形用金型は、請求項１又は２記載のノズルホルダーの製造に用いられ、前記圧粉体の下面を形成する下面パンチと、前記圧粉体の上面を形成する上面パンチとを備え、ダイ内において原料粉末を前記両パンチにより圧縮して前記圧粉体を形成する成形用金型であって、前記下面パンチは、前記腕部及び前記突設部の下面を形成する腕側下面形成部と、前記凹部を形成する凹部形成部とを備え、この凹部形成部の先端には前記段部を形成する段部形成部が設けられているものである。   A molding die according to a third aspect is used for manufacturing the nozzle holder according to the first or second aspect, and includes a lower surface punch that forms the lower surface of the green compact and an upper surface that forms the upper surface of the green compact. A molding die for forming the green compact by compressing raw powder in the die with the two punches, wherein the lower surface punch forms the lower surface of the arm portion and the protruding portion An arm side lower surface forming portion and a recess forming portion for forming the recess, and a step forming portion for forming the step is provided at the tip of the recess forming portion.

また、請求項４の製造方法は、請求項３記載の成形用金型を用いて前記圧粉体を成形し、この圧粉体を焼結して焼結合金からなる前記ノズルホルダーを成形し、前記焼結合金の前記腕部の内面に機械加工を施さないものである。   According to a fourth aspect of the present invention, the green compact is molded using the molding die according to the third aspect, and the green compact is sintered to form the nozzle holder made of a sintered alloy. The inner surface of the arm portion of the sintered alloy is not machined.

請求項１の構成によれば、噴射ノズルに係合する突設部の基端と腕部の基端側下面とを傾斜面により連結した構造であるから、屈曲角部などに応力が集中することがなく、強度的に安定した構造のノズルホルダーが得られる。そして、焼結前の圧粉体を形成するパンチは、傾斜部と凹部とを形成する部分の先端が段部に対応した厚さを有するため、金型強度を確保することができる。   According to the configuration of the first aspect, since the base end of the projecting portion that engages with the injection nozzle and the base end side lower surface of the arm portion are connected by the inclined surface, stress concentrates on the bent corner portion or the like. And a nozzle holder having a stable structure can be obtained. And since the front-end | tip of the part which forms the green compact before sintering has the thickness corresponding to the step part in the part which forms an inclination part and a recessed part, mold intensity | strength is securable.

また、請求項２の構成によれば、組み込み時に凹部が隙間となって噴射ノズルを案内し易くなり、装着性が向上する。   Moreover, according to the structure of Claim 2, a recessed part becomes a clearance gap at the time of integration, and it becomes easy to guide an injection nozzle, and mounting | wearing property improves.

また、請求項３の構成によれば、凹部形成部の先端部分に所定の肉厚を付与することができるから、部分的な金型圧損が防止され、金型強度を確保できる。   Moreover, according to the structure of Claim 3, since predetermined | prescribed thickness can be provided to the front-end | tip part of a recessed part formation part, partial mold pressure loss is prevented and mold intensity | strength can be ensured.

また、請求項４の構成によれば、機械加工を不要とし、製造コストの削減が可能となる。   Moreover, according to the structure of Claim 4, machining is unnecessary and it becomes possible to reduce manufacturing cost.

本発明における好適な実施の形態について、添付図面を参照しながら詳細に説明する。なお、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。各実施例では、従来とは異なる新規な内燃機関用焼結合金製ノズルホルダーとその成形用金型及び成形方法を採用することにより、従来にない内燃機関用焼結合金製ノズルホルダーとその成形用金型及び成形方法が得られ、その内燃機関用焼結合金製ノズルホルダーとその成形用金型及び成形方法について記述する。   Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, a new sintered alloy nozzle holder for an internal combustion engine, a molding die and a molding method thereof, which are different from the conventional one, and a sintered alloy nozzle holder for an internal combustion engine and its molding that are not conventional. A sintered alloy nozzle holder for an internal combustion engine, its molding die and molding method will be described.

以下、本発明の実施例について説明すると、図１〜図７は本発明の実施例１を示し、同図に示すように、ノズルホルダー１は、先端側に平面略Ｕ字の二股状をなす左右の腕部２，２を有し、これら腕部２，２の先端間に噴射ノズル61を側面から挿入する挿入開口部３が設けられている。前記両腕部２，２の先端部２Ｓ，２Ｓの内面２Ａ，２Ａは、互いに略平行に形成され、それら両腕部２，２の先端部２Ｓ，２Ｓの基端を、連結内面である半円形の円弧状内面４により連結し、前記両腕部２，２の先端部２Ｓ下部に、噴射ノズル61に係合する突設部５，５を下方に向って突設し、この突設部５の基端側と前記腕部２の下面７の基端側とを傾斜部６により連結し、前記両腕部２，２間に前記噴射ノズル61が嵌合保持される。   Hereinafter, embodiments of the present invention will be described. FIGS. 1 to 7 show Embodiment 1 of the present invention. As shown in FIG. 1, the nozzle holder 1 has a bifurcated shape having a substantially U-shape on the front end side. There are left and right arm portions 2, 2, and an insertion opening 3 for inserting the injection nozzle 61 from the side surface is provided between the tips of these arm portions 2, 2. The inner surfaces 2A and 2A of the distal end portions 2S and 2S of the both arm portions 2 and 2 are formed substantially parallel to each other, and the proximal ends of the distal end portions 2S and 2S of the both arm portions 2 and 2 are half of the connecting inner surface. The projecting portions 5 and 5 that engage with the injection nozzle 61 are projected downward from the lower ends of the distal ends 2S of the both arm portions 2 and 2, and are connected by a circular arcuate inner surface 4. 5 and the base end side of the lower surface 7 of the arm portion 2 are connected by the inclined portion 6, and the injection nozzle 61 is fitted and held between the arm portions 2 and 2.

また、ノズルホルダー１は、腕部２，２の基端側に本体８を一体に備え、この本体８の中央側に貫通孔９が設けられ、図５に示すように、固定部たる前記貫通孔９にボルト10に挿通し、このボルト10を内燃機関本体であるシリンダのシリンダヘッド11に固定することにより、ノズルホルダー１がシリンダヘッド11に固定される。   Further, the nozzle holder 1 is integrally provided with a main body 8 on the base end side of the arm portions 2 and 2, and a through hole 9 is provided in the center side of the main body 8, and as shown in FIG. The nozzle holder 1 is fixed to the cylinder head 11 by inserting the bolt 10 through the hole 9 and fixing the bolt 10 to the cylinder head 11 of the cylinder as the main body of the internal combustion engine.

前記噴射ノズル61は、略円筒状に形成され、前記シリンダヘッド11に形成した孔12に挿着される。そして、噴射ノズル61は、その円筒状の本体部62に、前記腕部２，２が側面から嵌合して保持されると共に、前記本体部62より大径なフランジ部63の上面に前記突設部５の下面が当接し、これによりシリンダヘッド11に固定される。   The injection nozzle 61 is formed in a substantially cylindrical shape, and is inserted into a hole 12 formed in the cylinder head 11. The jet nozzle 61 is held by the cylindrical main body portion 62 with the arm portions 2 and 2 fitted from the side, and the projection 61 projects from the upper surface of the flange portion 63 having a larger diameter than the main body portion 62. The lower surface of the installation portion 5 abuts and is fixed to the cylinder head 11 by this.

このようなノズルホルダー１において、前記傾斜部６の内面には、前記腕部２の先端部２Ｓの内面と略平行で、該傾斜部６の肉厚を薄く形成する凹部21が設けられ、前記突設部５の内面５Ａと前記凹部21との間には左右方向の段部22が形成されている。また、前記凹部21の上面23は前記腕部２の下面７と略面一に形成されている。尚、左右の段部22，22は、半円形の円弧状内面４の直径上にほぼ位置する。   In such a nozzle holder 1, the inner surface of the inclined portion 6 is provided with a recess 21 that is substantially parallel to the inner surface of the distal end portion 2 </ b> S of the arm portion 2 and that makes the inclined portion 6 thin. A step portion 22 in the left-right direction is formed between the inner surface 5A of the protruding portion 5 and the concave portion 21. The upper surface 23 of the recess 21 is formed substantially flush with the lower surface 7 of the arm portion 2. The left and right step portions 22 and 22 are substantially located on the diameter of the semicircular arcuate inner surface 4.

次に、製造方法について説明すると、ノズルホルダー１は、鉄系金属粉などからなる原料粉末Ｍを成形用金型31に充填した後、原料粉末Ｍを圧縮して圧粉体Ｐを成形し、その後、所定の雰囲気ガス中で圧粉体Ｐを焼成した焼結合金からなり、さらに、必要に応じてその焼結合金に矯正（サイジング）が施される。   Next, the manufacturing method will be described. After filling the raw material powder M made of iron-based metal powder into the molding die 31, the nozzle holder 1 compresses the raw material powder M to form the green compact P, Then, it consists of the sintered alloy which baked the green compact P in predetermined | prescribed atmospheric gas, and also corrects (sizing) the sintered alloy as needed.

図６〜図７は圧粉体Ｐを成形する成形用金型31を示し、同図に示すように、成形用金型31は、上下方向を軸方向（プレス上下軸方向）としており、ダイ32、コアロッド33、圧粉体Ｐの下面を形成する下面パンチたる上パンチ35と、圧粉体Ｐの上面を形成する上面パンチたる下パンチ34とを備えている。すなわち、この例では、ノズルホルダー１の上下を逆さにした状態の圧粉体Ｐを成形する。ダイ32はほぼ円筒形状で、このダイ32内にほぼ円柱形状のコアロッド33が同軸的に位置している。下パンチ34は、ほぼ円筒形状で、ダイ32およびコアロッド33間に下方から上下動自在に嵌合している。上パンチ35は、ほぼ円筒形状で、ダイ32およびコアロッド33間に上方から上下動自在にかつ挿脱自在に嵌合するものである。そして、ダイ32とコアロッド33と下パンチ34との間に充填部36が形成され、前記ダイ32の内周面が圧粉体Ｐの外周面を形成し、前記下パンチ34の上面が圧粉体Ｐの上面を形成し、前記上パンチ35の下面37が前記圧粉体Ｐの下面を形成し、コアロッド33の外周面が前記貫通孔９を形成する。   6 to 7 show a molding die 31 for molding the green compact P. As shown in the figure, the molding die 31 has an up-down direction as an axial direction (press up-down axis direction), and a die 32, a core rod 33, an upper punch 35 that is a lower surface punch that forms the lower surface of the green compact P, and a lower punch 34 that is an upper surface punch that forms the upper surface of the green compact P. That is, in this example, the green compact P in a state where the nozzle holder 1 is turned upside down is formed. The die 32 has a substantially cylindrical shape, and a substantially cylindrical core rod 33 is coaxially positioned in the die 32. The lower punch 34 has a substantially cylindrical shape and is fitted between the die 32 and the core rod 33 so as to be vertically movable from below. The upper punch 35 has a substantially cylindrical shape, and is fitted between the die 32 and the core rod 33 so as to be movable up and down from above and detachably. A filling portion 36 is formed between the die 32, the core rod 33, and the lower punch 34, the inner peripheral surface of the die 32 forms the outer peripheral surface of the green compact P, and the upper surface of the lower punch 34 is the green compact. The upper surface of the body P is formed, the lower surface 37 of the upper punch 35 forms the lower surface of the green compact P, and the outer peripheral surface of the core rod 33 forms the through hole 9.

前記上パンチ35の断面形状はノズルホルダー１の平断面形状に対応し、その上パンチ35の下面37は、前記腕部２の下面７及び突設部５の下面を形成する腕側下面形成部51と、前記凹部21を形成する凹部形成部52とを備え、この凹部形成部52の先端には前記段部22を形成する段部形成部53が設けられている。尚、凹部形成部52は段部形成部53から基端側に向って次第に肉厚になるように形成されている。   The cross-sectional shape of the upper punch 35 corresponds to the flat cross-sectional shape of the nozzle holder 1, and the lower surface 37 of the upper punch 35 is an arm-side lower surface forming portion that forms the lower surface 7 of the arm portion 2 and the lower surface of the protruding portion 5. 51 and a recess forming portion 52 for forming the recess 21, and a step forming portion 53 for forming the step 22 is provided at the tip of the recess forming portion 52. The recess forming part 52 is formed so as to gradually become thicker from the stepped part forming part 53 toward the base end side.

そして、図６に示すように、前記充填部36に、原料粉末Ｍを充填し、上，下パンチ35，34により充填部36内の原料粉末Ｍを加圧することにより圧粉体Ｐを圧縮成形する。さらに、これに続く工程で、上パンチ35がダイ32の上方に上昇し、下パンチ34の上昇により圧粉体Ｐをダイ32内から排出し、これを繰り返して圧粉体Ｐを連続形成する。このような圧粉体Ｐの圧縮成形において、上パンチ35には繰り返し圧縮荷重などが加わるが、凹部21を形成する凹部形成部52は、その先端が段差形成部53により所定の肉厚を備えるため、その金型強度を確保でき、金型圧損を防止することができる。尚、圧粉体Ｐにおいて、腕部２の内面側に出っ張るように前記凹部形成部対応箇所を肉厚に形成した場合では、半円形内面４の先端側が狭まるから、焼結合金の段階で、別途機械加工が必要となるが、先端に段差形成部53を有する凹部形成部52を設けることにより、機械加工などを施すことなく半円形内面４を形成することができる。   Then, as shown in FIG. 6, the filling part 36 is filled with the raw material powder M, and the upper and lower punches 35, 34 press the raw material powder M in the filling part 36, thereby compressing the green compact P. To do. Further, in the subsequent process, the upper punch 35 rises above the die 32, and the green compact P is discharged from the die 32 by the rise of the lower punch 34, and this is repeated to continuously form the green compact P. . In such compression molding of the green compact P, a compression load or the like is repeatedly applied to the upper punch 35. However, the tip of the recess forming portion 52 that forms the recess 21 has a predetermined thickness due to the step forming portion 53. Therefore, the mold strength can be ensured and mold pressure loss can be prevented. In addition, in the green compact P, when the concave portion forming portion corresponding portion is formed thick so as to protrude to the inner surface side of the arm portion 2, the tip side of the semicircular inner surface 4 is narrowed. Although machining is separately required, the semicircular inner surface 4 can be formed without machining or the like by providing the concave portion forming portion 52 having the step forming portion 53 at the tip.

このように本実施例では、請求項１に対応して、内燃機関の燃料を噴射する噴射ノズル61を内燃機関本体であるシリンダのシリンダヘッド11に固定し、左右の腕部２，２の先端に噴射ノズル61を側面から挿入する挿入開口部３を有すると共に、両腕部２，２の基端側を連結内面である円弧状内面４により連結し、両腕部２，２の先端下面に噴射ノズル61のフランジ部63に係合する突設部５，５を突設し、この突設部５の基端側と腕部２の基端側下面とを傾斜部６により連結し、両腕部２，２間に噴射ノズル61を嵌合保持する焼結合金製ノズルホルダーであって、傾斜部６の内面に凹部21を設けると共に、突設部５の内面と凹部21との間に段部22を形成し、噴射ノズル61に係合する突設部５の基端と腕部２の基端側下面とを傾斜面６により連結した構造を採用することにより、角部などに応力が集中することがなく、強度的に安定した構造のノズルホルダー１が得られる。そして、焼結前の圧粉体Ｐを形成する上パンチ35は、傾斜部６と凹部21とを形成する部分の先端が段部22に対応した厚さを有するため、金型強度を確保することができる。   Thus, in this embodiment, corresponding to claim 1, the injection nozzle 61 for injecting the fuel of the internal combustion engine is fixed to the cylinder head 11 of the cylinder which is the main body of the internal combustion engine, and the distal ends of the left and right arm portions 2, 2 And has an insertion opening 3 through which the injection nozzle 61 is inserted from the side, and the base ends of both arms 2 and 2 are connected by an arcuate inner surface 4 which is a connecting inner surface. Protruding portions 5 and 5 that engage with the flange portion 63 of the injection nozzle 61 are protruded, and the base end side of the projecting portion 5 and the base end side lower surface of the arm portion 2 are connected by the inclined portion 6. A sintered alloy nozzle holder in which the injection nozzle 61 is fitted and held between the arm portions 2 and 2, and a concave portion 21 is provided on the inner surface of the inclined portion 6, and between the inner surface of the protruding portion 5 and the concave portion 21. A step portion 22 is formed, and the base end of the projecting portion 5 that engages with the injection nozzle 61 and the base end side lower surface of the arm portion 2 are connected by the inclined surface 6. By adopting, without stress is concentrated on the outer edge portion, the nozzle holder 1 intensity stable structure is obtained. The upper punch 35 for forming the green compact P before sintering has a thickness corresponding to the step portion 22 at the tip of the portion where the inclined portion 6 and the concave portion 21 are formed, so that the mold strength is ensured. be able to.

また、このように本実施例では、請求項２に対応して、凹部21の上面23は腕部２の基端側の下面７と略面一に形成されているから、組み込み時に凹部が隙間となって噴射ノズル61を案内し易くなり、装着性を向上することができる。   In this way, in this embodiment, corresponding to claim 2, the upper surface 23 of the recess 21 is formed substantially flush with the lower surface 7 on the proximal end side of the arm portion 2, so that the recess is not a gap during assembly. Thus, it becomes easier to guide the injection nozzle 61, and the mounting property can be improved.

また、このように本実施例では、請求項３に対応して、請求項１又は２記載のノズルホルダー１の製造に用いられ、圧粉体Ｐの下面を形成する下面パンチたる上パンチ35と、圧粉体Ｐの上面を形成する上面パンチたる下パンチ34とを備え、ダイ32内において原料粉末Ｍを両パンチ35，34により圧縮して圧粉体Ｐを形成する成形用金型31であって、上パンチ35は、圧粉体Ｐの腕部２及び突設部５の下面を形成する腕側下面形成部51と、圧粉体Ｐの凹部21を形成する凹部形成部52とを備え、この凹部形成部52はパンチの移動方向に突設されており、前記凹部形成部52の先端には段部22を形成する段部形成部53が設けられているから、凹部形成部52の先端部分に所定の肉厚を付与することができ、部分的な金型圧損が防止され、金型強度を確保できる。   Thus, in this embodiment, corresponding to claim 3, the upper punch 35, which is used for manufacturing the nozzle holder 1 according to claim 1 or 2 and forms the lower surface of the green compact P, A molding die 31 for forming the green compact P by compressing the raw material powder M with the two punches 35 and 34 in the die 32. The upper punch 35 includes an arm side lower surface forming portion 51 that forms the lower surface of the arm portion 2 and the projecting portion 5 of the green compact P, and a concave portion forming portion 52 that forms the concave portion 21 of the green compact P. The recess forming portion 52 is provided so as to project in the moving direction of the punch, and a step forming portion 53 for forming the step 22 is provided at the tip of the recess forming portion 52. A predetermined thickness can be imparted to the front end portion of the mold, partial mold pressure loss can be prevented, and mold strength can be ensured.

また、このように本実施例では、請求項４に対応して、請求項３記載の成形用金型を用いて圧粉体Ｐを成形し、この圧粉体Ｐを焼結して焼結合金からなるノズルホルダー１を成形し、焼結合金の腕部２の内面２Ａおよび連結内面４に機械加工を施さないから、焼結製品によりノズルホルダー１の製造コストを削減することができる。   In this way, in this embodiment, corresponding to claim 4, the green compact P is molded using the molding die according to claim 3, and the green compact P is sintered and sintered. Since the nozzle holder 1 made of gold is molded and the inner surface 2A and the connecting inner surface 4 of the arm portion 2 of the sintered alloy are not machined, the manufacturing cost of the nozzle holder 1 can be reduced by the sintered product.

尚、本発明は、前記実施形態に限定されるものではなく、種々の変形実施が可能である。例えば、連結面は円弧面に限らず、ノズルホルダーの形状に対応すれば、多角形や楕円形などの一部からなる各種の形状を採用できる。また、傾斜部の下面は、実施例で示したように曲線状でもよいし、直線状でもよい。   In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible. For example, the connecting surface is not limited to an arc surface, and various shapes including a polygonal shape, an elliptical shape, or the like can be adopted as long as it corresponds to the shape of the nozzle holder. Further, the lower surface of the inclined portion may be curved as shown in the embodiment or may be linear.

本発明の実施例１を示すノズルホルダーの斜視図である。It is a perspective view of the nozzle holder which shows Example 1 of this invention. 同上、ノズルホルダーの要部の斜視図である。It is a perspective view of the principal part of a nozzle holder same as the above. 同上、ノズルホルダーの縦断面図である。It is a longitudinal cross-sectional view of a nozzle holder same as the above. 同上、ノズルホルダーの平面図である。It is a top view of a nozzle holder same as the above. 同上、ノズルホルダーの使用状態を示す断面図である。It is sectional drawing which shows the use condition of a nozzle holder same as the above. 同上、成形用金型の断面図である。It is sectional drawing of a metal mold | die for a mold same as the above. 同上、下面パンチの斜視図である。It is a perspective view of a lower surface punch same as the above. 従来例を示すノズルホルダーの斜視図である。It is a perspective view of the nozzle holder which shows a prior art example. 従来例を示す成形用金型のパンチの斜視図である。It is a perspective view of the punch of the metal mold | die which shows a prior art example. 従来例を示す成形用金型のパンチの要部の平面図である。It is a top view of the principal part of the punch of the metal mold | die which shows a prior art example.

符号の説明Explanation of symbols

１ ノズルホルダー
２ 腕部
２Ａ 内面
３ 挿入開口部
４ 円弧状内面（連結内面）
５ 突設部
６ 傾斜部
７ 下面
21 凹部
22 段部
23 上面
Ｍ 原料粉末
Ｐ 圧粉体
31 成形用金型
35 上パンチ（下面パンチ）
37 下面
51 腕側下面形成部
52 凹部形成部
53 段部形成部
61 噴射ノズル

DESCRIPTION OF SYMBOLS 1 Nozzle holder 2 Arm part 2A Inner surface 3 Insertion opening part 4 Arc-shaped inner surface (connection inner surface)
5 Projecting part 6 Inclined part 7 Lower surface
21 recess
22 steps
23 Upper surface M Raw material powder P Compact
31 Mold
35 Upper punch (lower punch)
37 Bottom
51 Arm side lower surface forming part
52 Recessed part
53 Step formation section
61 Injection nozzle

Claims (4)

内燃機関の燃料を噴射する前記噴射ノズルの固定に用いられ、左右の腕部の先端に噴射ノズルを側面から挿入する挿入開口部を有すると共に、前記両腕部の基端側を連結内面により連結し、前記両腕部の先端下面に前記噴射ノズルに係合する突設部を突設し、この突設部の基端側と前記腕部の基端側下面とを傾斜部により連結し、前記両腕部間に前記噴射ノズルを嵌合保持する焼結合金製ノズルホルダーであって、前記傾斜部の内面に凹部を設けると共に、前記突出部の内面と前記凹部との間に段部を形成したことを内燃機関用焼結合金製ノズルホルダー。 Used to fix the injection nozzle for injecting fuel of the internal combustion engine, and has insertion openings for inserting the injection nozzles from the side surfaces at the distal ends of the left and right arms, and the base end sides of both arms are connected by a connecting inner surface A projecting portion that engages with the injection nozzle on the lower surface of the distal end of both arms, and the base end side of the projecting portion and the lower surface of the base end side of the arm portion are connected by an inclined portion; A nozzle holder made of a sintered alloy for fitting and holding the injection nozzle between the arms, wherein a concave portion is provided on the inner surface of the inclined portion, and a step portion is provided between the inner surface of the protruding portion and the concave portion. What is formed is a nozzle holder made of sintered alloy for internal combustion engines. 前記凹部の上面は前記腕部の基端側下面と略面一に形成されていることを特徴とする請求項１記載の内燃機関用焼結合金製ノズルホルダー。 2. The sintered alloy nozzle holder for an internal combustion engine according to claim 1, wherein an upper surface of the concave portion is formed substantially flush with a lower surface on a proximal end side of the arm portion. 請求項１又は２記載のノズルホルダーの製造に用いられ、前記圧粉体の下面を形成する下面パンチと、前記圧粉体の上面を形成する上面パンチとを備え、ダイ内において原料粉末を前記両パンチにより圧縮して前記圧粉体を形成する成形用金型であって、前記下面パンチは、前記腕部及び前記突設部の下面を形成する腕側下面形成部と、前記凹部を形成する凹部形成部とを備え、この凹部形成部の先端には前記段部を形成する段部形成部が設けられていることを特徴とする内燃機関用焼結合金製ノズルホルダーの成形用金型。 It is used for manufacture of the nozzle holder of Claim 1 or 2, Comprising: The lower surface punch which forms the lower surface of the said green compact, The upper surface punch which forms the upper surface of the said green compact, A molding die that compresses with both punches to form the green compact, wherein the lower surface punch forms an arm side lower surface forming portion that forms the lower surface of the arm portion and the protruding portion, and the concave portion. A molding die for a sintered alloy nozzle holder for an internal combustion engine, characterized in that a step forming portion for forming the step is provided at the tip of the recess forming portion. . 請求項３記載の成形用金型を用いて前記圧粉体を成形し、この圧粉体を焼結して焼結合金からなる前記ノズルホルダーを成形し、前記焼結合金の前記腕部の内面に機械加工を施さないことを特徴とする内燃機関用焼結合金製ノズルホルダーの製造方法。 The green compact is molded using the molding die according to claim 3, the green compact is sintered to form the nozzle holder made of a sintered alloy, and the arm portion of the sintered alloy is formed. A method of manufacturing a sintered alloy nozzle holder for an internal combustion engine, wherein the inner surface is not machined.
JP2005024403A 2005-01-31 2005-01-31 Nozzle holder made of sintered alloy for internal combustion engine, its molding die, and its forming method Pending JP2006207561A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009281169A (en) * 2008-05-20 2009-12-03 Sumitomo Electric Sintered Alloy Ltd Holder for fixation of fuel injection device
WO2010138789A3 (en) * 2009-05-29 2011-03-17 Cummins Intellectual Property, Inc. Fuel injector, clamping assembly and method of mounting a fuel injector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009281169A (en) * 2008-05-20 2009-12-03 Sumitomo Electric Sintered Alloy Ltd Holder for fixation of fuel injection device
WO2010138789A3 (en) * 2009-05-29 2011-03-17 Cummins Intellectual Property, Inc. Fuel injector, clamping assembly and method of mounting a fuel injector
US8047183B2 (en) 2009-05-29 2011-11-01 Cummins Intellectual Properties, Inc. Fuel injector, clamping assembly and method of mounting a fuel injector
CN102449298A (en) * 2009-05-29 2012-05-09 康明斯知识产权有限公司 Fuel injector, clamping assembly and method of mounting a fuel injector

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